Door-spring



UNITED STATES PATENT OFFICE.

WILLIAM W. ROBINSON, OF RIPON, WISCONSIN.

DOOR-SPRING.

SPECIFICATION forming part of Letters Patent No. 242,047, dated May 24, 1881. Application filed April 4, 1881. (No model.)

To all whom it may concern:

Be it known that I, 'WM. W. ROBINSON, 0f Ripon, in the county of Fond du Lac and State of Wisconsin, have invented a new and Improved Door-Spring; and I hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is an elevation of a door to which my improved spring is applied. Fig. 2 is a vertical section through the pin tie of the hinge; and Fig. 3 is a plan view of the spring removed.

My invention relates to that class of springs attached to doors to keep them closed, and has for its object to provide a spring which requires no fastening devices to be attached to the door or door-frame, and avoids the consequent defacing of them.

My invention consists in an endless wire spring provided. with duplex central coils, through which pass projected ends of the pintle of the spring, the bights of the wire resting, respectively, against the door and the doorframe.

In orderthat those skilled in the art may make and use my invention, I will proceed to describe the manner. in which I have carried it out.

In the said drawings, A is the door, and B the frame.

The leaves of the hinge are held together in the usual manner by a pint-1e, a, and the said pintle has its ends prolonged to engage and sustain two coils, b b, of the spring 0, which is constructed as follows: Startingfromapoint, 2, on the wire where the ends meet and are subseq uen tl y brazed together, the wire is projected and then coiled at 1) around the upper end of the pintle, and thence to a point, 3, on the door-frame, when it is bent into a bight or loop, passed back until it reaches the lower end of the pintle, when it is wound in coil 1) and the end carried onto point 2, when the ends are brazed, as aforesaid.

Washers or other devices 6 on the end of the pintle serve to retain the coils on the pintie, and a proper upsetting of the metal on the ends secures the washers.

The tendency of the coiled portion of the wire to uneoil keeps the bights or loops of the wire pressed against the frame and door, so that the spring is being constantly exerted to close the door.

It is evident that the spring may be applied to keep the door normally open by twisting the coils in a direction opposite to that shown in the drawings.

Having thus described my invention, what I claim as new, and desire to secure by Letters Paten t, is

The continuous spring 2 3, provided with the coils b l), in combination with and fitting over the ends of the pintle outside of the knuckles of the hinge, for the purpose specifled.

WILLIAM W. ROBINSON.

Witnesses:

J. W. HALL, FRANK A. HALL. 

